Method for preparing high grade non-oriented electrical steel adding rare earth cerium

Abstract

A preparation method of high grade non-oriented electrical steel added with rear earth cerium belongs to the technical field of electrical steel. High Si non-oriented electrical steel casting blank added with rare earth Ce is taken as the hot rolling material, and final high grade non-oriented electrical steel product with excellent magnetic property is obtained through hot rolling, normalizing, acid cleaning, cold rolling, anneal and coating; the design of hot rolling material components is required to meet that: C content is less than or equal to 0.005 percent, Si content is from 2.4 percent to 3.3 percent, Mn content is from 0.1 percent to 0.6 percent, Al content is from 0.8 percent to 1.5 percent, P content is less than or equal to 0.02 percent, S content is from 0.003 to 0.006 percent, N contend is less than or equal to 0.008 percent, O content is less than or equal to 0.015 percent, rare earth Ce is from 0.0015 percent to 0.0300 percent, the ratio of Ce and S is controlled from 0.7 to 7.0, the rest components are Fe and unavoidable impurities, and the component contents are based on weight percentage; the final magnetic property of the product is that when the thickness is 0.35mm, P1.2 / 50 is equal to 2.1W / kg to 2.6 W / kg, and B5000 / 50 is equal to 1.68T to 1.70T; when the thickness is 0.50mm, P1.5 / 50 is equal to 2.21 W / kg to 2.54 W / kg, and B5000 / 50 is equal to 1.70T to 1.72T. The method has the advantage of low production cost.

Description

technical field [0001] The invention belongs to the technical field of electrical steel, and in particular provides a high-grade non-oriented electrical steel with rare earth cerium added (non-oriented high-grade electrical steel is an electrical steel production researcher who meets the magnetic properties of P 1.5 / 50 ≤4.40W / kg, B 5000 / 50 At the same time, the preparation method of all non-oriented electrical steel products that meet the minimum requirements of the national standard) has excellent magnetic properties. Background technique [0002] Silicon steel is a ferrosilicon alloy with a silicon content of about 3% and other mainly iron. It is an indispensable and important soft magnetic alloy for electric power, electronics and military industry, and it is also the metal functional material with the largest output. It is mainly used as the iron core of various motors, generators and transformers. Its production process is complicated and the manufacturing technology ...

AI Technical Summary

Problems solved by technology

This patent has better magnetic properties, but the content of Si in the steel is low, there are many other alloys such as Mn, Al, Cu, etc., and the cost is high. In addition, intermediate annealing and temper rolling are used in cold rolling. Rolling, more processes, higher cost

[0006] 3. Chinese patent CN 1827820 discloses a non-oriented electrical steel and its manufacturing method, characterized in that Si: 0.08-1.30%, Sb: 0.0050-0.050%, B: 0.0005-0.005%, Ca or REM0.005-0.10 %, this invention uses many alloys, due to the low Si content, low magnetic properties, P 1.5 / 50 It can only reach 3.152W / kg at the lowest level, and can only be used as a soft magnetic alloy material for the production of general motor cores

The addition of alloying elements is high and the cost increases

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